[英]java.net.UnknownHostException Cannot create socket. Java
我阅读了一些手册,并尝试创建Socket,如示例所示。
Socket socket = new Socket(InetAddress.getByName("http://google.com"), 80);
要么
Socket socket = new Socket("http://google.com", 80);
无论如何,我都会得到UnknownHostException:
java.net.UnknownHostException: http://google.com: Name or service not known
如何运作?
import java.io.*;
import java.net.*;
public class socket_client
{
public static void main(String[] args) throws IOException
{
Socket s = new Socket();
String host = "www.google.com";
try
{
s.connect(new InetSocketAddress(host , 80));
}
//Host not found
catch (UnknownHostException e)
{
System.err.println("Don't know about host : " + host);
System.exit(1);
}
System.out.println("Connected");
}
}
请尝试www.google.com
。 我刚刚尝试了telnet http://google.com
,但无法连接。 telnet www.google.com 80
确实可以连接。
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